Biogeographical comparison of Lagarosiphon major between native South Africa and invaded New Zealand: A natural enemy release case study?

IF 3.7 2区农林科学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biological Control Pub Date : 2024-07-14 DOI:10.1016/j.biocontrol.2024.105584

Nompumelelo Catherine Baso , Angela Bownes , Quentin Paynter , Arnaud Cartier , Martin Patrick Hill , Julie Angela Coetzee

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引用次数: 0

Abstract

The Enemy Release Hypothesis (ERH) suggests that the absence of natural enemies (herbivores, parasites, and diseases) in non-native environments allow exotic plants to allocate more resources towards growth and reproduction, resulting in increased invasiveness. This study uses the submerged macrophyte Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae), native to Southern Africa, as a case study of this hypothesis. This species is invasive in many parts of the world, including Ireland, the United Kingdom and New Zealand. Here, we investigate the applicability of the ERH in explaining the invasiveness of L. major in New Zealand. This was achieved by comparing L. major biomass and cover, and plant species richness between L. major’s native range in South Africa and its invaded range in New Zealand, where specialist natural enemies were presumed to be lacking. The findings revealed significantly higher L. major biomass (∼100 % increase), cover (∼28 % increase) and shoot production (∼91 % increase) in the invaded range compared to the native range. Additionally, overall species richness and abundance was negatively correlated with L. major abundance in the invaded range. Plants in the native range were associated with more natural enemies and experienced higher levels of damage relative to the invaded sites. Overall, these observations align with the ERH, but should be interpreted with caution as other influential factors such as competition were not measured. Nevertheless, this suggests that L. major could benefit from the integration of biological control measures with the existing methods of control. Two natural enemies, Polypedilum tuburcinatum Andersen (Diptera: Chironomidae) and Hydrellia lagarosiphon Deeming (Diptera: Ephydridae) have already been identified as promising candidates, for biological control of L. major in New Zealand and other regions invaded by this weed.

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原产于南非和入侵新西兰的 Lagarosiphon major 的生物地理学比较：天敌释放案例研究？

天敌释放假说（ERH）认为，非本地环境中缺乏天敌（食草动物、寄生虫和疾病）会使外来植物将更多资源用于生长和繁殖，从而增加入侵性。本研究以原产于南部非洲的水生大型藻类 Lagarosiphon major (Ridl.) Moss ex Wager（水藻科）为例，对这一假设进行了研究。该物种在世界许多地方都具有入侵性，包括爱尔兰、英国和新西兰。在此，我们研究了 ERH 在解释 L. major 在新西兰的入侵性方面的适用性。为此，我们比较了南非大叶黄杨原生地与新西兰大叶黄杨入侵地之间的大叶黄杨生物量、覆盖度和植物物种丰富度。研究结果表明，与原生地相比，被入侵地区的大叶黄杨生物量（增加 100 %）、覆盖度（增加 28 %）和嫩枝产量（增加 91 %）均明显增加。此外，物种的总体丰富度和丰度与被入侵地区的大叶桉丰度呈负相关。与入侵地点相比，原生地的植物与更多的天敌相关，受到的危害程度也更高。总体而言，这些观察结果与 ERH 一致，但由于没有测量竞争等其他影响因素，因此应谨慎解释。尽管如此，这表明将生物防治措施与现有的防治方法相结合可使大叶女贞受益。两种天敌：Polypedilum tuburcinatum Andersen（双翅目：摇蚊科）和 Hydrellia lagarosiphon Deeming（双翅目：鞘翅目）已被确定为有希望在新西兰及其他受大叶黄杨入侵地区对其进行生物防治的候选天敌。

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来源期刊

Biological Control 生物-昆虫学

CiteScore

7.40

自引率

7.10%

发文量

220

审稿时长

63 days

期刊介绍： Biological control is an environmentally sound and effective means of reducing or mitigating pests and pest effects through the use of natural enemies. The aim of Biological Control is to promote this science and technology through publication of original research articles and reviews of research and theory. The journal devotes a section to reports on biotechnologies dealing with the elucidation and use of genes or gene products for the enhancement of biological control agents. The journal encompasses biological control of viral, microbial, nematode, insect, mite, weed, and vertebrate pests in agriculture, aquatic, forest, natural resource, stored product, and urban environments. Biological control of arthropod pests of human and domestic animals is also included. Ecological, molecular, and biotechnological approaches to the understanding of biological control are welcome.